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Direct Heteroarylation Polymerization of Low Bandgap Thiophene-Based Conjugated Polymers

  • Jiyeon Yoon (a1), Se Hyun Jang (a1), Sang Yong Kim (a1), Sun Jae Kwon (a1), Jing Guo (a1) and Yong Ku Kwon (a1)...

Abstract

Direct heteroarylation polymerization was employed to synthesize a novel low bandgap polymer, used as a p-type material of polymer photovoltaic cells. To achieve low bandgap of conjugated polymers, electron donor-acceptor (D-A) alternating strategy was used. The electron-donating 3-alkylthiophene and electron-withdrawing cyanothiophene were coupled to be polymerized via direct heteroarylation polymerization. The cyano moiety of the polymer backbone allowed a strong intermolecular interaction between neighboring chains and improved the structural perfection of the crystal structure on the substrate. The solar cell devices of ITO/PEDOT:PSS/P3HT:PCBM/LiF/Al were fabricated on ITO-coated glass substrate.

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